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Provisions - Summary of Movement of Other Provisions (Detail)
€ in Millions
12 Months Ended
Dec. 31, 2017
EUR (€)
Disclosure of Provisions [Line Items]  
Other provisions beginning balance € 1,423
Charges 643
Releases (191)
Utilisation (414)
Currency translation (142)
Other provisions ending balance 1,319
Restructuring [Member]  
Disclosure of Provisions [Line Items]  
Other provisions beginning balance 291
Charges 318
Releases (79)
Utilisation (161)
Currency translation (17)
Other provisions ending balance 352
Legal [Member]  
Disclosure of Provisions [Line Items]  
Other provisions beginning balance 125
Charges 139
Releases (16)
Utilisation (43)
Currency translation (13)
Other provisions ending balance 192
Brazil Indirect Taxes [Member]  
Disclosure of Provisions [Line Items]  
Other provisions beginning balance 672
Charges 43
Releases (75)
Utilisation (206)
Currency translation (78)
Other provisions ending balance 356
Other [Member]  
Disclosure of Provisions [Line Items]  
Other provisions beginning balance 335
Charges 143
Releases (21)
Utilisation (4)
Currency translation (34)
Other provisions ending balance € 419